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<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;!DOCTYPE <span class="keyword">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">&quot;UTF-8&quot;</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">title</span>&gt;</span><span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">script</span> <span class="attr">src</span>=<span class="string">&quot;http://cdn.bootcss.com/jquery/3.1.1/jquery.min.js&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">p</span>&gt;</span>hello world!<span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">p</span>&gt;</span>hello world!!<span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">p</span>&gt;</span>hello world!!!<span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">p</span> <span class="attr">class</span>=<span class="string">&quot;test&quot;</span>&gt;</span>test hello world<span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">h4</span> <span class="attr">class</span>=<span class="string">&quot;test&quot;</span>&gt;</span>test title<span class="tag">&lt;/<span class="name">h4</span>&gt;</span></span><br><span class="line"></span><br><span class="line">		<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">&quot;text&quot;</span> <span class="attr">id</span>=<span class="string">&quot;inputtextId1&quot;</span> <span class="attr">class</span>=<span class="string">&quot;form-control&quot;</span> <span class="attr">placeholder</span>=<span class="string">&quot;https://jsonblob.com/api/jsonBlob/xxx&quot;</span> <span class="attr">value</span>=<span class="string">&quot;123&quot;</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">button</span>&gt;</span>隐藏<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">script</span>&gt;</span><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript">			$(<span class="variable language_">document</span>).<span class="title function_">ready</span>(<span class="keyword">function</span>(<span class="params"></span>)&#123;</span></span><br><span class="line"><span class="language-javascript">				<span class="comment">//用户点击按钮后，所有 &lt;p&gt; 元素都隐藏：</span></span></span><br><span class="line"><span class="language-javascript">				$(<span class="string">&quot;button&quot;</span>).<span class="title function_">click</span>(<span class="keyword">function</span>(<span class="params"></span>)&#123;</span></span><br><span class="line"><span class="language-javascript">					$(<span class="string">&quot;p&quot;</span>).<span class="title function_">hide</span>();</span></span><br><span class="line"><span class="language-javascript">				&#125;);</span></span><br><span class="line"><span class="language-javascript">			&#125;);</span></span><br><span class="line"><span class="language-javascript">		</span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>jQuery 中所有选择器都以美元符号开头：<code>$()</code>。</p>
<h4 id="一、元素选择器"><a href="#一、元素选择器" class="headerlink" title="一、元素选择器"></a>一、元素选择器</h4><p>jQuery 元素选择器基于元素名选取元素。</p>
<p>在页面中选取所有 <code>&lt;p&gt;</code> 元素:</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$(&quot;p&quot;)</span><br></pre></td></tr></table></figure>



<h4 id="二、id-选择器"><a href="#二、id-选择器" class="headerlink" title="二、id 选择器"></a>二、id 选择器</h4><p>jQuery <code>#id</code> 选择器通过 HTML 元素的 id 属性选取指定的元素,页面中元素的 id 应该是唯一的。</p>
<p>通过 id 选取元素语法如下：</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$(&quot;#myDiv&quot;);//获取div元素</span><br></pre></td></tr></table></figure>

<p>获取<code>textFiled</code>值</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">var tfValue10= $(&quot;input[id=&#x27;inputtextId1&#x27;]&quot;).val();  </span><br><span class="line">var tfValue11= $(&quot;#inputtextId1&quot;).val();</span><br><span class="line">var tfValue12= $(&quot;input[name=&#x27;inputtextId1&#x27;]&quot;).val();</span><br><span class="line">var tfValue13= $(&quot;input[type=&#x27;text&#x27;]&quot;).val();</span><br><span class="line">var tfValue14= $(&quot;input[type=&#x27;text&#x27;]&quot;).attr(&quot;value&quot;);</span><br></pre></td></tr></table></figure>



<h4 id="三、-class-选择器"><a href="#三、-class-选择器" class="headerlink" title="三、.class 选择器"></a>三、<code>.class</code> 选择器</h4><p>jQuery 类选择器可以通过指定的 class 查找元素。</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$(&quot;.test&quot;)</span><br></pre></td></tr></table></figure>



<p>赋值</p>
<p>输入框赋值方式,Input输入框ID为inputtextId</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">$(&quot;#inputtextId&quot;)[0].value=&quot;8888&quot;;</span><br><span class="line">$(&quot;#inputtextId&quot;).val(&quot;88888&quot;);</span><br></pre></td></tr></table></figure>



<p>参考文档</p>
<p><a target="_blank" rel="noopener" href="http://www.w3school.com.cn/jquery/jquery_selectors.asp">http://www.w3school.com.cn/jquery/jquery_selectors.asp</a></p>
<p><a target="_blank" rel="noopener" href="http://www.w3school.com.cn/jquery/jquery_ref_selectors.asp">http://www.w3school.com.cn/jquery/jquery_ref_selectors.asp</a></p>
<p><a target="_blank" rel="noopener" href="http://www.runoob.com/jquery/jquery-selectors.html">http://www.runoob.com/jquery/jquery-selectors.html</a></p>
<p><a target="_blank" rel="noopener" href="http://www.cnblogs.com/keepfool/archive/2012/06/02/2532203.html">http://www.cnblogs.com/keepfool/archive/2012/06/02/2532203.html</a></p>
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